Found this thread again and wanted to include this page I came across- Error-ref.com LINK in case it has any relevance to the nickle in question.
The triangles on the OP coin seem to be a different shape triangle.
What do you guys (and ladies) think?
(Scroll down to the nickel minted on the cancelled Rupee)

Last edited by PetesPockets55 on Mon Mar 26, 2018 9:37 pm, edited 1 time in total.

Question To the OP ?
Could PM them to let them know this is being revisited?
And you're right Mark, it could easily be damage but the same year and the overall shape is what triggered my recall.
(Not to say someone didn't try to mimic what they saw at Error-ref.com)

This is what I see (but then again I miss a lot.)
The marks on the OP's coin are opposite each other on the Rev. & Obv. with no apparent s showing opposite the diamond patterns.

On the Error-ref coin, the diamond pattern appears only in the center 1/3 to center 1/2 of the coin. The "cancellation" diamonds are probably produced by a continuous "rolling punch" +- 1/2" (12mm) to 3/4" wide with the diamonds off set from each other.

Here is another- 1964p Lincoln cent LINK with cancellation marks also (full width of the coin though).
The NGC article mentions a 1964d Jefferson nickel produced on a 1/4 Rupee coin as well.
So there is precedence for coins being struck on 1/4 Rupee's at both Philly and Denver.
Hmmmmm....

For a start the OP could weigh it have the coin tested to see what it is made of, nickel or silver?